#include <stdio.h>

struct Books
{
    char title[50];
    char author[50];
    char subject[100];
    int book_id;
} book = {
    "c 语言",
    "yellres",
    "编程",
    5656};

int main()
{

    printf("title: %s\nauthor: %s\nsubject: %s\nbook_id: %d\n",
           book.title,
           book.author,
           book.subject,
           book.book_id);
}
